1. RHS SCIENCE TAKS REVIEW
DNA
Animation factory

2. All cells contain chromosomes Chromosomes are made of DNA
DNA contains the code for life
All cells contain Chromosomes
Chromosomes are made of DNA
Sections of DNA which code for genetic information are called genes

3. DNA is made up of a series of monomers called NUCLEOTIDES

4. Each nucleotide has 3 parts
A sugar called deoxyribose
A phosphate molecule
A nitrogenous base

5. Two kinds of bases The purines Have 2 rings in their structure Include
adenine
guanine

6. Two kinds of bases The pyrimidines Have 1 ring Include cytosine
thymine
thymine C H4

7. The backbone of the DNA chain is formed by the
Sugar
Phosphate

8. The “rungs” of the ladder are made of bases
A - T G - C
The bases are held together by hydrogen bonds

9. The 2 DNA chains are joined together forming a
Double helix

10. SELF TEST What two parts are the same in all nucleotides?
Which two bases are purines?
What holds the double helix together?
Sugar and phosphate

11. BYE